diff --git a/TOOLS/checktree.sh b/TOOLS/checktree.sh
index 2e4f7ac366..a4dd6abc75 100755
--- a/TOOLS/checktree.sh
+++ b/TOOLS/checktree.sh
@@ -105,7 +105,7 @@ list_svn() {
 
 for i in "$@"; do
     case "$i" in
-    -help)
+    -help|--help|-h|-\?)
         echo -e "\n$0 [options] [files]\n"
         echo -e "options:\n"
         printoption "spaces    " "test for spaces in filenames" "$_spaces"